Design vision system to recognize the scribed number on the wafer

Liaw, Geok Pheng (2014) Design vision system to recognize the scribed number on the wafer. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This project is carry on as industrial implementation with Silterra. Sdn. Bhd. The company existing vision machine very expensive and the sample being scanned and stored in the database unable to modified or editable. The company requested to design vision system to replace the existing one. Therefore, the objective of the project is to design a vision system by using Matlab Simulink to recognize the scribed number on the wafer and store the detected scribed number in Excel file. Due to unable to physically test at the company, therefore the testing sample and hardware setup to mimic the environment at the production line should be considered. Besides that, the theory for techniques of Optical Character Recognition (OCR) and previous work related to project are studied and a concept of designing the vision system is carried out. To validate the result, the hardware setup to mimic the environment at the Silterra production line and testing sample both are considered. Besides being valid, a test should also be reliable, to ensure the vision system able to perform well, three experiments are carry out and each experiment are tested by 100 good and 100 not good testing samples which is to identify the best image size, median filter, and the matching percentage respectively. For the confirmation test, with the best identified parameter from previous experiment, to test others 100 good and 100 not good testing sample to the system in the existing of white and yellow color of light to ensure system can produce up to 95% of recognition, and this also can identify whether the final result will or will not be affected by color of light. Based on the result finding, the vision system design actually can have up to 100% of recognition, and cheaper price compare to the existing vision machine at the company. As the conclusion, hopefully the vision system design can really apply at Silterra Sdn. Bhd.

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